diff --git a/src/aro/Parser.zig b/src/aro/Parser.zig
index 39f15b8a..7276d177 100644
--- a/src/aro/Parser.zig
+++ b/src/aro/Parser.zig
@@ -6934,7 +6934,7 @@ fn unExpr(p: *Parser) Error!Result {
                 try p.errStr(.invalid_argument_un, tok, try p.typeStr(operand.ty));
 
             try operand.usualUnaryConversion(p, tok);
-            if (operand.val.is(.int, p.comp)) {
+            if (operand.val.is(.int, p.comp) or operand.val.is(.float, p.comp)) {
                 _ = try operand.val.sub(Value.zero, operand.val, operand.ty, p.comp);
             } else {
                 operand.val = .{};
diff --git a/test/cases/float values.c b/test/cases/float values.c
new file mode 100644
index 00000000..3d16702c
--- /dev/null
+++ b/test/cases/float values.c	
@@ -0,0 +1,2 @@
+_Static_assert(-1.0 - 1.0 == -2.0, "");
+_Static_assert(-2.0f == -2.0, "");